libpysal.cg.Chain¶
-
class
libpysal.cg.
Chain
(vertices: list)[source]¶ Geometric representation of a chain, also known as a polyline.
- Parameters
- vertices
python:list
A point list or list of point lists.
- vertices
Examples
>>> c = Chain([Point((0, 0)), Point((1, 0)), Point((1, 1)), Point((2, 1))])
- Attributes
-
__init__
(self, vertices: list)[source]¶ Initialize self. See help(type(self)) for accurate signature.
Methods
__init__
(self, vertices)Initialize self.
Attributes
Returns the geometric length of the chain computed using ‘arcdistance’ (meters).
Returns the bounding box of the chain.
Returns the geometric length of the chain.
Returns the parts (lists of
libpysal.cg.Point
objects) of the chain.Returns the segments that compose the chain.
Returns the vertices of the chain in clockwise order.
-
property
arclen
¶ Returns the geometric length of the chain computed using ‘arcdistance’ (meters).
-
property
bounding_box
¶ Returns the bounding box of the chain.
- Returns
- self._bounding_box
libpysal.cg.Rectangle
The bounding box of the chain.
- self._bounding_box
Examples
>>> c = Chain([Point((0, 0)), Point((2, 0)), Point((2, 1)), Point((0, 1))]) >>> c.bounding_box.left 0.0
>>> c.bounding_box.lower 0.0
>>> c.bounding_box.right 2.0
>>> c.bounding_box.upper 1.0
-
property
len
¶ Returns the geometric length of the chain.
Examples
>>> c = Chain([Point((0, 0)), Point((1, 0)), Point((1, 1)), Point((2, 1))]) >>> c.len 3.0
>>> c = Chain( ... [ ... [Point((0, 0)), Point((1, 0)), Point((1, 1))], ... [Point((10, 10)), Point((11, 10)), Point((11, 11))] ... ] ... ) >>> c.len 4.0
-
property
parts
¶ Returns the parts (lists of
libpysal.cg.Point
objects) of the chain.Examples
>>> c = Chain( ... [ ... [Point((0, 0)), Point((1, 0)), Point((1, 1)), Point((0, 1))], ... [Point((2, 1)), Point((2, 2)), Point((1, 2)), Point((1, 1))] ... ] ... ) >>> len(c.parts) 2
-
property
segments
¶ Returns the segments that compose the chain.
-
property
vertices
¶ Returns the vertices of the chain in clockwise order.
Examples
>>> c = Chain([Point((0, 0)), Point((1, 0)), Point((1, 1)), Point((2, 1))]) >>> verts = c.vertices >>> len(verts) 4